Yui menus only visible in center region in IE?

Not sure if this is a bug that appeared in yui 0.12 - despite setting the z-index of div.yuimenu to a very high value, the yui menus are still not visible in all regions other than the center layout region, e.g. you see the menu clipped and portions visible only in the center region.

Anyone else encountered this problem? Works fine in firefox, but not in IE6 and IE7.

Okay, confirmed that the iframe hosting the menu is created as a direct child of the document body.

And if I push up the zIndex of the iframe, it still does not appear in regions other than the center, also this results in the menu options not being selectable - so it seems that the zIndices of the content will need to be pushed up accordingly as well. Will check further.